feat: collapseNesting native/compact enum in the options panel

[matthew-dean]

collapseNesting became an enum in Less 5.0.0-alpha — false | 'native' | 'compact' (true is a deprecated alias for 'native'). This surfaces it in the options panel as a select instead of a boolean switch.

• false — keep authored nesting (the v5 default).
• native — the CSS Nesting desugaring: parent wrapped in :is(), child selector lists distributed, so each branch keeps its own specificity (matches the browser and Less 4.x).
• compact — like native but also folds same-combinator descendant runs into a single :is().

Only src/options.ts changes — the option table drives the UI, so App.vue/Select.vue are untouched. Select values are strings, so renderOptions normalizes 'false'/'true' back to booleans before they reach less.render (harmless for the other selects; no math/unitMode value is 'true'/'false'). Still gated to v5 (min: '5.0.0'); 4.x is unaffected.

Note: rendering native vs compact distinctly needs the Less wrapper's enum passthrough (less/less.js#4533 → 5.0.0-alpha.7); on alpha.6 the option coerces to a boolean. The playground loads the latest alpha dist-tag, so it lights up automatically once alpha.7 publishes.

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Configuration used: Organization UI

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Plan: Advanced

Run ID: 569a54ca-7f8e-4a6f-ad67-c0943b0a16f0

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• src/options.ts

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📝 Walkthrough

Walkthrough

The collapseNesting option changes from a boolean to the string enum 'false' | 'native' | 'compact'. Its default changes to 'false', and its descriptor becomes a select with these values. renderOptions now converts string boolean values to booleans before passing options to less.render, while preserving other values.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 1d5c2

The option update has a consistent UI and version-gated rendering path, with no established merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: exposing the collapseNesting native and compact enum values in the options panel.
Description check	✅ Passed	The description accurately explains the collapseNesting enum, select control, Less version gating, and string normalization behavior.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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